KR101942362B1 - Plasma beauty device - Google Patents

Abstract

The present invention relates to a plasma cosmetic device, comprising: a charging/discharging battery provided within an internal holding space made by an upper case and a lower case; and a high alternate current voltage forming unit forming high alternate current voltage having peak to peak voltage of greater than 8 kV to less than or equal to 12 kV, which is applied to a discharging electrode wherein the external surface of the upper and lower cases is made of an insulator not having a contact point electrically connected to the charging/discharging battery, the high alternate current voltage forming unit and the discharging electrode. The high alternate current voltage forming unit includes: a control unit supplying a PWM control signal with a first duration; and a high alternate current voltage output unit supplying high alternate current voltage with a second duration, which is shorter than a first duration, to the discharging electrode. According to the present invention, the plasma cosmetic device is equipped with only a positive electrode therein, thereby being able to solve problems that an electrode having a complex structure has to be formed and a voltage application manner has to be complexly designed in a conventional both side electrodes type plasma cosmetic device.

Description

{PLASMA BEAUTY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma cosmetic device, and more particularly, to a plasma cosmetic device using air discharge to generate plasma through air discharge using high pressure and supply generated plasma to a user's skin.

The solid, which is the lowest energy state of the material, receives energy, gradually becomes a liquid, and then a gas. At this time, sufficient energy above the ionization energy is applied to the neutral gas, and ionization and recombination of electrons and ions can generate plasmas composed of electrons, ions, neutral atoms and molecules.

In this plasma, electrons are called ionized electrically conductive gas because they have almost the same amount of positive and negative charges (electrons) and maintain the neutrality of electrons while they are close to free particles. Plasma is classified into density and electron temperature, though there are many criteria such as plasma density, electron temperature, degree of thermal equilibrium between species, generation method and application field.

For example, the plasma can be divided into local thermal equilibrium (LTE) and non-local thermal equilibrium (non-LTE) by the degree of thermal equilibrium. Local thermal equilibrium means that the plasma is locally uniform in temperature, Means a thermodynamic state where equilibrium is maintained.

Plasma used for research and manufacturing processes is usually one of LTE or non-LTE plasma, and the former is called thermal plasma and the latter is called cold plasma. Atmospheric pressure plasma is mainly used in the fields of surface modification, coating and environmental purification of materials.

In recent years, related research has been expanded to be applicable to biomedical field and biomedical field, and atmospheric plasma jet apparatus is being studied in biomedical field. The electrode structure of the plasma jet is mostly needle-shaped, and a variety of configuration methods have been studied depending on the power supply apparatus. Inert gas is mainly injected from the outside and a high voltage is applied to the needle electrode structure to generate plasma.

In addition, a dielectric barrier discharge (DBD) type plasma jet apparatus in which a small hole is formed in the center of a small circular parallel plate has been introduced.

Various types of plasma jet power supply devices are introduced according to the driving frequency, and a DC pulse power supply and an AC power supply are used as low frequency power supply devices of tens to hundreds of kHz.

In addition, plasma jets are widely used for sterilization and sterilization purposes. Plasma containing oxygen radicals have been studied in applications such as tooth whitening, pathogen destruction, and blood coagulation. Major issues in the utilization of the biomedical field include miniaturization And ease of control and stability to the human body are important.

In addition, securing stability against electric shock is an important task for direct application to living cells or human body. Therefore, in order to secure the stability, the electrode to which the high voltage is applied should not be in direct contact with the sample and the human body, and the driving voltage to be applied to the electrode should be low and the plasma current amount should be controlled to a small value of 1 to 2 mA, I should not.

And the minimum current that can be detected by the human body is about 1mA in 60Hz commercial frequency alternating current, and the sensing current should increase with increasing frequency, and the current feeling in pain is 7 ~ 8mA. It is also a thermal element.

Next, as for the conventional technology using the plasma, a technique for eradicating the bacteria attached to the face or the skin using the light carbonized plasma is disclosed in the portable beauty device using the plasma (Korean Utility Model Application No. 2011-0003121) And a plasma skin regeneration apparatus (Korean Patent No. 10-1262632) has a technique for generating glow plasma to be used for skin treatment. However, there is a problem that the plasma is directly transferred to the skin of the portable beauty equipment and the plasma skin regenerating apparatus using the plasma, thereby damaging the skin.

In addition, if a conventional portable beauty device using plasma is classified according to an electrode method provided therein, it is possible to provide only a + electrode and a + electrode (hereinafter, referred to as a ' And a method of providing a contact electrode that can be grounded to a human body on the outside of the case (hereinafter, referred to as a "+ electrode system").

Korean Patent Laid-Open Publication No. 10-2016-0035742 discloses a two-side electrode type beauty device. In the two-side electrode type, a high voltage is applied to both electrodes while a positive electrode and a negative electrode are spaced apart from each other . However, this method is not easy because (1) it is necessary to use a fine process for designing to keep the distance between the + electrode and the - electrode within 50 μm, (2) the power must be supplied to both the + electrode and the And the design of the supply line becomes complicated.

Next, the + electrode method has a + electrode only inside the cosmetic device, and has a contact electrode on the outer surface of the housing. In use, the user's hand contacts the contact electrode to use the user's body as a contact electrode. However, in the + electrode method, the user's hand must touch the contact electrode in close contact. In actual use, the contact electrode and the touch are not normally performed.

Korea public utility model 20-2011-0003121 (published on March 29, 2011) Korean Registered Patent No. 10-1262632 (Registered on May 3, 2013) Korean Patent Laid-Open No. 10-2016-0035742 (published on Apr. 01, 2016)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a discharge electrode for a cosmetic device, which comprises only a positive electrode and has no separate contact electrode on its outer surface, There is no need to provide a plasma cosmetic device capable of reducing the occurrence of sparks.

Another object of the present invention is to propose a voltage applying method suitable for a plasma beauty apparatus in which only a + electrode is provided in a cosmetic device and no separate contact electrode is provided on the outer surface of the case.

The above objects of the present invention are achieved in a plasma aesthetic device comprising an upper case, a lower case, a discharge electrode, a discharge electrode accommodating portion provided in the upper case, and a coupling cap which is engaged with and separated from the upper case to open and close the discharge electrode accommodating portion And an AC high voltage forming unit for forming an AC high voltage having a peak to peak voltage of 8 kV or less and 12 kV or less, which is applied to the charge / discharge battery and the discharge electrode, provided in the inner accommodating space formed by the upper case and the lower case, The case is formed by an insulator whose outer surface is not provided with a contact electrically connected to the charge / discharge battery, the AC high voltage forming portion, and the discharge electrode. The AC high voltage forming portion includes a controller for supplying a PWM control signal having a first duration, An AC high voltage having a second duration shorter than the first duration is supplied to the discharge electrode And a high alternating-current voltage output portion for supplying the discharge electrode can be achieved by plasma cosmetic treatment apparatus according to claim consisting of the + electrode method, unlike the above-described method either side electrode. Since the expression "+ electrode system" is not a formally used term, it can be described that the discharge electrode is composed of only electrodes which do not form a ground to clearly indicate this.
Preferably, the AC high voltage supplied to the discharge electrode is alternately supplied to the positive voltage and the negative voltage with a lapse of time, and the waveform is attenuated in amplitude.

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Preferably, the AC high voltage forming unit further includes a DC power boosting unit that receives a voltage from the charge / discharge battery, boosts the voltage and outputs the voltage, and an AC high voltage generating unit that generates an AC high voltage using the PWM control signal supplied from the control unit .

Preferably, the AC high voltage generating portion includes a primary coil of a coil transformer having a start terminal and a finisher terminal, a first capacitor connected between the finishing terminal and the ground, a finishing terminal connected to the drain terminal, And the source terminal includes a second MOS FET connected to the ground, and the start terminal is connected to the DC power supply voltage boosting portion, and the AC high voltage output portion is formed by the secondary side coil of the coil transformer.

The AC high voltage supplied to the discharge electrode is an AC waveform having a second duration of several hundreds to 10 microseconds and the AC high voltage is supplied to the discharge electrode continuously n times at intervals of the first period And the second period is repeatedly supplied in a second period passing through a pausing period T3 and the first period is 100us or more and 500us or less and the second period is 10ms or more but 50ms or less, .
Preferably, the alternating current waveform has a + waveform and a waveform and is composed of a waveform whose amplitude attenuates with time. The second duration is defined by a + waveform having a maximum peak constituting an AC waveform and a waveform having a minimum peak occurring consecutively thereto. Quot; means the duration of the main wave which is composed only of the main wave.

The plasma cosmetic device according to the present invention can solve the problems such as the need to form an electrode having a complicated structure and the complicated design of a voltage applying method which are possessed by a beauty device for both side electrodes.

In addition, the plasma beauty apparatus according to the present invention can smoothly supply plasma to the user's skin by applying a suitable voltage supplying method without providing a separate contact electrode on the outer surface of the case. Therefore, in the case of the conventional + electrode type plasma beauty apparatus, since it is not necessary to closely contact the contact electrode when using the user's hand, it can be used more conveniently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a plasma cosmetic device according to one embodiment of the present invention in a frontal view. FIG.
FIG. 2 is an exploded bottom perspective view of a plasma cosmetic device according to an embodiment of the present invention. FIG.
FIG. 3 is a front perspective view of a plasma cosmetic device according to an embodiment of the present invention. FIG.
4 is a perspective view of a connection electrode constituting a plasma aesthetic device according to an embodiment of the present invention;
5 is a cross-sectional view illustrating the state before and after the connection of the connection electrode and the discharge electrode.
6 is a driving circuit block diagram of a plasma beauty apparatus.
7 is a specific implementation circuit diagram of an AC high voltage generating section and an AC high voltage output section in the driving circuit of the plasma augmentation apparatus.
Fig. 8 is a photograph of an output waveform of the circuit diagram of Fig. 7 designed by the inventor of the present invention measured by an oscilloscope. Fig.
9 is an AC high voltage timing diagram supplied to a discharge electrode of a plasma augmentation apparatus according to the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Also, in the present specification, the term " above or above " means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction. It will also be understood that when a section of an area, plate, or the like is referred to as being " above or above another section ", this applies not only to the case where the other section is " And the like.
Also, in this specification, when an element is referred to as being " connected " or " connected " with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.
Also, in this specification, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

FIG. 1 is an exploded perspective view of a plasma cosmetic device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a plasma cosmetic device according to an embodiment of the present invention, Fig. 3 is a front perspective view of the plasma beauty apparatus; Fig. 1 to 3, a description will be given of a configuration of a plasma cosmetic device according to the present invention.

The plasma beauty apparatus comprises a lower case 60 and an upper case 50 and a printed circuit board 30 is provided in a space formed by coupling the lower case 60 and the upper case 50. A discharge electrode accommodating portion 53 for accommodating the discharge electrode 20 is formed on the upper surface of the upper case 50 and the discharge electrode accommodating portion 53 is opened and closed by a coupling cap 10 in a detachable attaching / Or closed. A coupling groove and a coupling protrusion are formed and coupled to the upper case 50 and the coupling cap 10, respectively. The lower case 60 and the upper case 50 are formed of a nonconductive material such as ABS or PC.

An operation switch 31 is provided between the lower case 60 and the lower surface of the printed circuit board 30 and a part of the operation switch 31 is exposed to the operation switch groove 61 formed in the lower case 60, On / off < / RTI > On the printed circuit board 30, a chargeable and dischargeable battery 38 is provided, and other operation circuit portions 37 and USB terminals 39 are mounted. And is configured to be able to charge the chargeable and dischargeable battery 38 by using the USB terminal 39. A fastening screw (not shown) is fitted through a fastening screw engaging groove 55 formed in the upper case 50. The fastening screw is projected through a through hole 35 formed in the printed circuit board 30, (65) formed on the base (60).

FIG. 4 is a perspective view of a connection electrode constituting a plasma aesthetic device according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a state before and after connection of a connection electrode and a discharge electrode. The fastening screws 53a and 53b provided on the lower surface of the discharge electrode receiving portion 53 of the upper case 50 shown in FIG. 2 are fastened with fastening screw engagement grooves 33a and 33b provided on the connection electrode shown in FIG. The connecting electrode 33 is screwed.

As shown in FIG. 5, the discharge electrode 20 includes a discharge electrode plate 21, a discharge electrode plate 21, and a discharge electrode plate 21. The discharge electrode plate 21 includes a circular disk formed of a conductor, a fin portion extending downward from the center of the circular disk, 21, and a dielectric protective film 25 bonded to the fin portions. The thickness tb of the dielectric film 23 formed below the discharge electrode 20 is formed to be thicker than the thickness tu of the dielectric film 23 formed on the discharge electrode 20 (tu <tb). This is because the plasma generated by the discharge electrode plate 21 is generated more forward. The dielectric film 23 is made of a dielectric material such as silicon or ceramic to prevent the arc discharge from being generated in the plasma discharge pattern to prevent the human body (skin) from being damaged. The dielectric protective film 25 is formed of a nonconductive silicon material.

5, a discharge electrode insertion groove 51 is formed at the center of the discharge electrode receiving portion 53 formed in the lower case 50, and the discharge electrode plate 21 The connecting electrode 33 having a leaf spring composed of a conductor formed to be spaced apart from each other by a predetermined distance is opened and the corresponding pin portion is joined to form an electrically connected state. Of course, the separation distance of the leaf spring constituting the connection electrode 33 before the coupling with the fin portion should be configured to be closer to the diameter of the fin portion.

6 is a block diagram of a driving circuit of a plasma beauty apparatus. The power supplied from the charge / discharge battery is input to the DC power supply voltage boosting unit. When the input voltage of 3.7 [V] is applied, for example, the DC power step-up part boosts the output voltage to approximately 20 [V]. The control unit generates a PWM control signal and supplies the PWM control signal to the AC high voltage generating unit. The AC high voltage generating unit is controlled by the PWM control signal and is output through the AC high voltage output unit, and finally supplied to the discharge electrode.

7 is a specific implementation circuit diagram of the AC high voltage generating section and the AC high voltage output section in the driving circuit of the plasma augmentation apparatus. The AC high voltage generating unit is composed of a primary coil of the coil transformer T1, a second MOS FET Q2 and a first capacitor C1, and the AC high voltage output unit is constituted by a secondary coil of the coil transformer T1.

The DC power boosting unit is connected to the start terminal 5 of the coil transformer T1 and the finisher terminal 3 of the coil transformer T1 is connected to the drain terminal of the second MOS FET Q2 and one terminal of the first capacitor C1 . The source terminal of the second MOSFET Q2 is connected to the ground, and the gate terminal of the second MOSFET Q2 is connected to the control unit to receive the PWM control signal having the first duration. The other terminal of the first capacitor C1 is connected to the ground. When the PWM control signal is ON, the second MOSFET Q2 is turned on to generate a current path PATH formed by the DC power supply voltage up converter, the coil transformer T1, and the second MOSFET Q2. At this time, (C1) is completely discharged. The first capacitor C1 is charged instantaneously as the counter electromotive force by the coil having the second duration is generated when the PWM control signal is switched from the ON state to the OFF state, (8 kV second to 12 kV or less) having a second duration is output to the discharge electrode. Here, the second duration is designed to be shorter than the first duration, and the circuit can be constituted by a comparatively inexpensive control unit (usually constituted by a microcomputer capable of generating a PWM control signal) according to this characteristic. That is, in order to implement a control unit having a duration shorter than a constant duration applied in the industry, it is necessary to use an expensive microcomputer. When the circuit shown in FIG. 7 is used, a short duration required for a plasma- High-voltage alternating current can be formed.

In the circuit diagram of FIG. 7, SiC MOS FET is used as the second MOS FET Q2 to reduce the 'ON' state resistance. According to the inventor of the present invention, when the frequency (f ₀ ) of a pulse excited to the secondary side by the counter electromotive force is measured and the first capacitor value is selected according to Equation (1) and designed by the LC resonance circuit, It becomes possible to supply an AC high voltage, which is formed by a sinusoidal wave alternately applied to the + waveform and the - waveform, to the discharge electrode, as shown in Fig.

Where L is the primary coil capacitance of the coil transformer T1 and C1 is the capacitance of the first capacitor.

Fig. 8 is a photograph of an output waveform of the circuit diagram of Fig. 7 designed by the inventor of the present invention, measured by an oscilloscope. When the sine wave attenuating while alternately outputting the + waveform and the -waveform shown in FIG. 9 is applied to the discharge electrode, it is possible to provide a high quality plasma in which the positive ions and the negative ions are uniformly distributed to the user's skin, .

9 is an AC high voltage timing diagram supplied to a discharge electrode of a plasma aesthetic device according to the present invention. The plasma beauty device according to the present invention can be called a + electrode method according to the internal electrode equipped method proposed in the prior art, but unlike the conventional plasma beauty device, a contact electrode that can be grounded to the human body is not provided outside the case Method. Due to such a feature, a higher voltage is required to be supplied to the discharge electrode compared with the '+ electrode type' plasma beauty apparatus having a contact electrode that can be grounded to the outside of the case, so that the same amount of plasma can be supplied to the skin . Generally, as the high voltage is applied to the discharge electrode, the frequency of occurrence of sparks on the user's skin is increased. Therefore, the duration and period for applying the AC high voltage should be accurately controlled in order to suppress the generation of sparks.

As shown in FIG. 9, the plasma aesthetic apparatus according to the present invention includes a high-voltage sine waveform having a second duration D2, and repeats the supply of n times continuously at intervals of a predetermined period T1 in T2 cycles. Here, the second duration D2 represents the duration to which the AC high-voltage sine waveform shown in FIG. 8 is applied, and strictly, the first + waveform ('first + waveform') having the maximum peak in the waveform shown in FIG. Means a duration of a main wave composed only of a first waveform having a minimum peak value (hereinafter referred to as &quot; first waveform &quot; An AC high voltage (peak to peak value) of more than 8 kV to 12 kV or less is applied to the discharge electrode in the plasma cosmetic device of the present invention. In the case of the conventional plasma beauty apparatus, it can be understood that a higher voltage is applied than in the case of the plasma beauty apparatus of the present invention, as compared with the case where AC high voltage of 4 kV to & kV is applied to the discharge electrode. This is because the outer surface of the case is not provided with a contact electrode connected to the user's body. According to the experiment of the inventor of the present invention, when AC high voltage of 8 kV or less was applied, plasma was not sufficiently generated and proper cosmetic effect could not be obtained. When ac high voltage higher than 12 kV was applied, generation of spark was difficult to suppress, .

The second duration (D2), which is the width of the AC high voltage to be irradiated at one time, is set to be 10 占 퐏 or less. Preferably, a duration of several hundreds to ten microseconds or less may be applied. When the AC high voltage exceeding 8kV to 12kV was applied during the second duration longer than 10μs, the skin caused pain, and when it was over 16μs, the plasma cosmetic device could not be used due to the pain.

 In the present invention, since the AC high voltage is formed by using the counter electromotive force of the coil transformer T1 using the circuit shown in FIG. 7, a sinusoidal waveform whose amplitude is attenuated over time is applied to the skin as shown in FIG. 8 . Therefore, the second duration D2 defined in the present invention means the duration of the main wave summing the sine half wave having the maximum + voltage and the sine half wave having the minimum voltage. In terms of applying plasma without pain, it is better to shorten the AC high voltage of more than 8 kV to less than 12 kV. However, the second duration with less than several hundred ns (about 400 ns) in circuit design is difficult to realize realistically.

Next, a period (T1) of AC high voltage continuously supplied n times is referred to as a first period (D2) which is more than 8kV to 12kV and less than several hundreds to 5μs based on the peak to peak voltage, The high alternating current voltage is designed to have a value of 100 s to 500 s. When the first period T1 is less than 100 mu s, it is difficult to cope with the circuit design. When the first period T1 is more than 500 mu s, sufficient plasma generation is difficult.

The second period T2 is designed to be not less than 10 ms but not more than 50 ms. If the discharge voltage is continuously applied to the discharge electrode without generating the plasma discharge in the second period T2, there is a danger of burns due to the high energy density and the risk of electric shock due to high voltage increases. Therefore, a second period having a rest period T3 as shown in Fig. 9 should be set.

When the second period T2 is formed to be smaller than 10 ms, it is difficult to set a sufficient rest period, so that a risk of burning increases and a dielectric surrounding the discharge electrode is deteriorated. When the second period T2 is set to be larger than 50 ms when the ratio T3 / T2 of the second period-based rest period T3 is set to 0.5, the user's skin is cooled during the rest period T3, There was a phenomenon that is not present.

While the preferred embodiments of the present invention have been described above using specific terms, such terms are used only for the purpose of clarifying the invention, and it is to be understood that the embodiments of the invention and the described terminology may be embodied in many different ways than those encompassed by the following claims It is self-evident that various changes and changes can be made without departing from the present invention. Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

10: coupling cap 20: discharge electrode
21: Plasma only electrode plate 23: Dielectric film
25: dielectric protective film 30: printed circuit board (PCB)
31: Operation switch 33: Connection electrode
33a, 33b, 55: fastening screw engaging groove
35: through hole 37: transformer coil
38: Battery 39: USB terminal
50: upper case 51: discharge electrode insertion groove
53: discharge electrode housing part 60: lower case
61: operation switch groove 53a, 53b, 65:

Claims (8)

delete delete delete And a coupling cap which is engaged with and separated from the upper case so as to open and close the discharge electrode receiving portion, the plasma beauty device comprising: an upper case, a lower case, a discharge electrode,
And an AC high voltage forming unit for forming an AC high voltage having a peak to peak voltage of 8 kV or less and a peak to peak voltage of 8 kV or less, which is applied to the charge / discharge battery and the discharge electrode provided in the inner accommodating space formed by the upper case and the lower case,
The ground is provided in the internal accommodation space without providing the upper case and the contact electrode capable of being grounded to the user's body from the outside of the lower case,
Wherein the discharge electrode is formed only of an electrode which does not form the ground,
Wherein the AC high voltage forming unit includes a DC power boosting unit for receiving a voltage from the charge / discharge battery, for boosting the voltage and outputting the voltage, and an AC high voltage generating unit for generating the AC high voltage using a PWM control signal,
The AC high voltage generator includes a primary coil of a coil transformer having a start terminal and a finisher terminal, a first capacitor connected between the finisher terminal and ground, and a second capacitor connected between the finisher terminal and the drain terminal, And a source terminal connected to the ground, wherein the start terminal is connected to the DC power source voltage up unit.
5. The method of claim 4,
Wherein the AC high voltage supplied to the discharge electrode is alternately supplied with a positive voltage and a negative voltage with an elapse of time and has an AC waveform attenuated in amplitude.
The method according to claim 4 or 5,
And the AC high voltage is supplied to the discharge electrode through the secondary side coil of the coil transformer.
The method according to claim 6,
Wherein the AC high voltage supplied to the discharge electrode is an AC waveform having a second duration and the AC high voltage is supplied to the discharge electrode n times consecutively at intervals of a first period and then repeatedly repeated at a second period passing through a stagnant period T3 &Lt; / RTI &
Wherein the second duration is several hundreds to ten microseconds, and the first period is not less than 100 us and not more than 500 us, and the second period is not less than 10 ms and not more than 50 ms.
8. The method of claim 7,
Wherein the AC waveform has a + waveform and a waveform and has an amplitude attenuating with time, and the second duration includes a + waveform having a maximum peak constituting the AC waveform and a waveform having a minimum peak occurring consecutively thereto, And the duration of the main wave composed only of the main wave.

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